Gregson's Daughter Comes To Watson For Help on Elementary Episode 20

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"A Stitch In Time"

Holmes and Watson investigate the murder of a professional skeptic, a man who debunked paranormal, religious and scientific phenomenon for a living. The case becomes urgent when his homicide reveals a potential threat to homeland security. Also, Captain Gregson’s daughter and fellow NYPD officer, Hannah (Liza J. Bennett), asks Watson for help with one of her cases